The comedian is inundated on social media with condolences, including one from former Twitter-quitter Alec Baldwin.

A chihuahua-pug mix that lived to the ripe, old age of 19, Duck was first discovered by the comedian at a no-kill shelter in Van Nuys, Calif., where he had been brought after being caught by L.A. animal control running through the streets of South Central. He quickly became Silverman's self-described "best friend," and appeared alongside her on her Comedy Central series, The Sarah Silverman Program.

"He was a happy dog, though serene. And stoic. And he loved love," Silverman writes in "an obituary type thing" she posted on Wednesday to her website. In it she relays how a veterinarian came to the home after Duck had recently stopped eating and administered a series of shots that put the dog to sleep.